N086, N186, N786. Pressure retaining valve, Plastic

Transcription

1 Pressure retaining valve, Plastic Construction The GEMÜ N086, N186 and N786 pressure retaining valves are used to provide a constant back pressure in process plant. If the inlet pressure rises above a preset value, the diaphragm is raised against the spring force. The valve opens and the excess pressure can escape into the outlet line. If the pressure on the inlet side is reduced, the valve closes as the spring force pushes the diaphragm against the seal seat. The spring force can be adjusted as required using a set screw and secured with the lock nut. Technical specifications* Nominal sizes: DN 10 to DN 100 Connections: Spigots, flanges, union ends with insert Body materials: PVC-U, PP-B, PVDF Seal materials: EPDM, PTFE Media temperature: -20 C to +100 C Setting range: 0.5 to 10 bar Advantages The working pressure can be very easily adjusted using a set screw and secured with the integrated lock nut. If required, the setting that has been made can be lead sealed. The flow-efficient design of the valve body ensures good flow rate values. Control errors are kept to a minimum due to the large control face and the spiral spring. The actuator is hermetically separated from the medium. *Dependent on version and/or operating parameters Sectional view

2 Technical data Working medium Corrosive, inert, liquid media which have no negative impact on the physical and chemical properties of the body and seal material.approved for fluids of Group 1 in accordance with directive 97/23/EC Article 9 whose steam pressure at the permissible maximum temperature is a maximum of 0.5 bar above the normal atmospheric pressure (1013 mbar). Working medium temperature Valve body PVC-U 10 to 60 C Valve body PP-B 5 to 80 C Valve body PVDF -20 to 100 C The permissible operating pressure depends on the working medium temperature. Ambient conditions Ambient temperature max. 60 C Technical data Type Nominal size PN Setting range [bar] GEMÜ N186 DN GEMÜ N086 DN DN GEMÜ N786 DN DN Pressure / temperature correlation for N186 (DN 10 - DN 50), N786 (DN 10 - DN 25) Temperature in C (plastic body) ± Valve body material Permissible operating pressure in bar PVC-U PP-B PVDF Data for extended temperature ranges on request. Please note that the ambient temperature and medium temperature generate a combined temperature at the valve body which must not exceed the above values. Pressure / temperature correlation for N086 (DN 65 - DN 80) Temperature in C (plastic body) ± Valve body material Permissible operating pressure in bar PVC-U PP-B PVDF Data for extended temperature ranges on request. Please note that the ambient temperature and medium temperature generate a combined temperature at the valve body which must not exceed the above values. Pressure / temperature correlation for N086 (DN 100), N786 (DN 32 - DN 40) Temperature in C (plastic body) ± Valve body material Permissible operating pressure in bar PVC-U PP-B PVDF Data for extended temperature ranges on request. Please note that the ambient temperature and medium temperature generate a combined temperature at the valve body which must not exceed the above values. 2

3 Diagrams - N186 DN DN 20 DN 25 DN 32 DN 40 DN 50 The characteristics in the diagrams show the pressure drop of the set pressure from 0 to max. permissible flow. The upper line shows the progression of the opening pressure, the lower line shows the progression of the closing pressure. All characteristics relate to water at 20 C. 3

4 Diagrams - N086 DN 65 DN 80 DN 100 The characteristics in the diagrams show the pressure drop of the set pressure from 0 to max. permissible flow. The upper line shows the progression of the opening pressure, the lower line shows the progression of the closing pressure. All characteristics relate to water at 20 C. 4

5 Diagrams - N786 DN 10 DN 15 DN 20 DN 25 DN 32 DN 40 The characteristics in the diagrams show the pressure drop of the set pressure from 0 to max. permissible flow. The upper line shows the progression of the opening pressure, the lower line shows the progression of the closing pressure. All characteristics relate to water at 20 C. 5

6 Order data Valve type Pressure retaining valve DN 65 - DN 100 N086 Pressure retaining valve DN 10 - DN 50 N186 Pressure retaining valve DN 10 - DN 40 N786 Valve body material PVC-U, grey 1 PVDF 20 PP-B B5 Body configuration 2/2-way body D Diaphragm material EPDM 14 PTFE/EPDM, PTFE laminated 52 Connection Spigots DIN 0 Flanges EN 1092 / PN10 / form B, length EN 558, series 1, ISO 5752, basic series 1 4 Union ends with DIN insert (socket) 7 Spigots for IR butt welding 20 Union ends with DIN insert (for IR butt welding) 78 For overview of available valve bodies see page 9 Order example N D Type N186 Nominal size 25 Body configuration (code) D Connection (code) 0 Valve body material (code) 1 Diaphragm material (code) 14 6

7 Dimensions [mm] DN d N086, N186 L L1 L , 78 ø D h H , 20 H L1 d ød L h 7, 78 L2 7

8 Dimensions [mm] DN d N786 L L1 L , 78 I H h D , 20 0, 20 D 4 L1 H 7, 78 h d l L L2 8

9 Connection code Material code DN Overview of valve bodies for N186, N , 20, B5 1, 20, B5 1, 20, B5 20, B5 20, B5 10 X X X X X X X X 20 X X X X X 25 X X X X X 32 X X X X X 40 X X X X X 50* X X X X X * DN 50 not for GEMÜ N786 All rights including copyright and industrial property rights are expressly reserved. Connection code Material code DN Overview of valve bodies for N , B5 20 1, B5 20 B X X X X X X 80 X - X - X X - X - X - Subject to alteration 11/ Should there be any doubts or misunderstandings, the German version of this data sheet is the authoritative document! VALVES, MEASUREMENT AND CONTROL SYSTEMS GEMÜ Gebr. Müller Apparatebau GmbH & Co. KG Fritz-Müller-Str. 6-8 D Ingelfingen-Criesbach Tel. +49(0)7940/123-0 Telefax +49(0)7940/ info@gemue.de